I'm not sure if this is the only way to get the factory shackles off but I used an air powered grinder. I just wanted anyone who is considering installing shackles to know that it is not as easy as people make it sound. The fronts were a piece of cake, the rears sucked! (it took about 1/2 hour to cut through each bolt)

The urethane bushings were a little too tight also. I guess I should have cut a little bit off them to make them fit but I didn't think of doing that until after I took them out and just used the original rubber ones in back. Total time was about 14 hours for one person.

I have a '92 YJ Renegade so the rear shackles are probably harder to get to because of the body kit. The bolts are inside out so you can't just slide them out because they hit the gas tank. The Renegade is cool but the body work can be a pain to work around sometimes.